David Ortiz, back on DL, to have PRP injection

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David Ortiz had a PRP injection on his right knee in 2007. He said it helped in his recovery from surgery.

Four days after being activated from the disabled list, David Ortiz was sent back Monday because of lingering soreness in his strained right Achilles’ tendon, which forced him to miss 35 games.

Ortiz said he expected to undergo a platelet-rich plasma (PRP) injection, which he hoped would give him a “60-70 percent’’ chance of getting back to make a contribution during the final 33 games of the season.

“You guys already know, I’d like to be out there playing, helping out,’’ Ortiz said Monday. “The good thing that we talked about today [with the team’s medical staff] is we’re going to try this one PRP injection to see how it goes.’’

The procedure involves drawing the patient’s blood and spinning it at a high speed to draw out the plasma, which contains a high concentration of platelets. The platelet-rich plasma is then injected.

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Ortiz had a PRP injection on his right knee in 2007. He said it helped in his recovery from surgery. When it was proposed Monday morning by the medical staff, the 36-year-old DH was eager to give it a try.

Ortiz might be able to avoid season-ending “shock wave’’ therapy, a procedure he said was “20-30 times more powerful than ultrasound’’ but required 4-5 weeks of recuperation.

“You guys know I live for this [game],’’ he said. “And there’s not one thing that I would like to do more than be out there performing for our fans. I had one [PRP injection] done before and I believe in that big-time. The thing is we didn’t get it done before because we thought it wasn’t needed in my case, but at this stage, at this point, I got to get through it.’’

Ortiz returned to the lineup Friday and doubled in his second at-bat, but experienced discomfort in his Achilles’ as he rounded first base.

“I thought I was going to be OK until I hit that double and I had to rush out to second base,’’ he said. “I felt that pain because I was running with the game intensity. The way I feel right now, it wasn’t right.’’

Ortiz did not travel with the team to Los Angeles for Tuesday’s game against Angels, but said he expects to join the team during its nine-game West Coast swing.

Asked if there was any consideration given to shutting down Ortiz, manager Bobby Valentine said, “Everyone felt if he had that desire, and the medical staff thought it was the best thing for his career, that would definitely be done.

“But with the meeting of the minds, with David wanting to get back in uniform and the medical staff believing there was a chance that he could [come back], we figured that’s the best way to go.’’

Aceves on his own

Alfredo Aceves, who was suspended Saturday three games for detrimental conduct to the team, did not travel with his teammates to Los Angeles.

Valentine said Aceves would travel on his own to LA, then rejoin the team once his suspension was lifted. Asked if he expected Aceves to be available to pitch, Valentine said, “Yeah, he’ll be ready to pitch. I believe he’ll be OK to pitch. He’s a workout fanatic. He’s not just sitting around eating popcorn.’’

With Andrew Bailey back, Valentine said he has not determined who will be the team’s closer.

Aceves reportedly removed his jersey and crumpled it in a ball when Bailey was summoned to close Friday night’s game.

Aceves angrily confronted Valentine in a closed-door meeting in the manager’s office afterward, slamming the door shut on his way out of the office.

“Remember, I don’t have a lot of rules,’’ Valentine said. “But one of the rules I stated early on was you don’t do anything to embarrass yourself, your teammates, or your organization. That’s a rule.’’

Lester: Bittersweet

Jon Lester said the blockbuster trade with the Dodgers was “bittersweet.’’

“Obviously, when you lose anybody like Josh [Beckett], it’s important,’’ said Lester, who welcomed the challenge of assuming a larger leadership role. “It puts a little more emphasis on the rest of us to do better, picking up his slack with him being gone.

“It was one of those deals where I was happy for Josh. Like he said, a change was necessary, but at the same time it was a little bittersweet for me, just because he’s been here with me since my first day. He’s been the guy who took me under his wing.

“My first couple of days here [former manager Terry Francona] pulled me aside and said, ‘Hey, follow Josh around, pay attention to what he’s doing and if you have any questions, go to him,’ and I did. He helped me become me, as far as being a pitcher. He’ll always be one of my closest friends in baseball and in life and he’ll definitely be missed, by me, in this clubhouse.’’

Kalish recalled

Ryan Kalish was recalled from Triple A Pawtucket, the third stint in Boston for the 24-year-old outfielder. To make room for Daisuke Matsuzaka, the Sox optioned righthander Pedro Beato to Pawtucket. Beato, 25, who was acquired from the Mets Aug. 16 in exchange for Kelly Shoppach, was called up from Pawtucket Sunday and earned the win in relief in an 8-6 triumph over the Royals . . . Clay Buchholz will start Tuesday’s opener against the Angels and Lester will start the finale Thursday, but Valentine has not decided on a starter for Wednesday’s game. “TBA,’’ the manager said. “I don’t think it’s going to be [Franklin] Morales.’’ . . . Dustin Pedroia singled in the third inning to reach safely in 20 of 21 games since Aug. 5, a stretch in which he has hit .364 with 11 doubles, a triple, 3 homers, 14 RBIs, and 18 runs . . . Scott Podsednik went 2 for 4 and has hit safely in a season-high seven straight games. He has had multiple hits in 11 of his last 22 games with a plate appearance . . . Jacoby Ellsbury went 2 for 4 and recorded his second homer of the season, a solo shot in the first. His sixth-inning double marked the 200th extra-base hit of his career . . . James Loney, acquired from the Dodgers Saturday, collected his second RBI single in as many games with the Sox. Loney packed for a flight back to LA after flying overnight from the West Coast and arriving Boston in the wee hours Sunday. “It’s been crazy,’’ he said. “At least I’ll be ready for the time change.’’

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